ZWO ASI 120MM-S USB 3.0 Mono Camera
ZWO ASI 120MM-S USB 3.0 Mono CameraZWO ASI 120MM-S USB 3.0 Mono CameraZWO ASI 120MM-S USB 3.0 Mono Camera

ZWO ASI 120MM-S USB 3.0 Mono Camera

£181.00✓ 2 year warranty


19x in stock shipped 1-2 working days

About this product

Model:  zwo_asi120mm-s
Part Number:  ASI120MM-S

The ZWO ASI120MM-S is a super-fast USB 3.0 version of the ASI120MM lunar and planetary imaging camera. 

Delivers up to 254x frames-per-second at reduced resolution or 60x FPS at full 1280X960 resolution! 

Peak QE of 75% (better than the ICX618) and no Fixed-Pattern-Noise!

It is also a very capable guide camera. Compared to ICX618 based cameras, like the Imaging Source DMK21AU618, ZWO ASI120MM offers significantly faster frame-rate, slightly higher sensitivity in visual light and more pixels for lunar imaging. 

For guiding it offers a solid performer that handles most setups with ease, including most OAG configurations. 

The sensor is protected by an anti-reflection clear optical window. If imaging the Moon or planets we recommend fitting a 1.25" UV/IR rejection filter. 

The ASI120MM-S’s mono sensor can also be used with specialised UV or methane band filters, as well as infrared passing filters for lunar and planetary imaging (i.e. Baader IR-Pass, Red and Orange visual filters). IR-passing filters cut short wavelengths which prevents atmospheric dispersion softening the image.

Note: The ASI120MM-S has a Micron sensor which might produce Newton Rings when used with solar telescopes. Cameras fitted with Sony sensors are better-suited to this application.

Supplied with a 150-degree accessory lens so you don't even need a telescope to start imaging the stars! 


  • The lens can be screwed in too far, result in a scratch on the protect window! Please adjust it very slowly! Don’t turn it beyond the focus at infinity!


ASI120 cameras have several reviews at world most popular astronomy magazines. You can read them in PDF documents:

All ZWO cameras include a 2-year warranty. 

Camera Field of View Simulator

ASI120MM QE Curve

What's in the box

  • ASI120MM-S Camera
  • 150° Lens
  • M42-1.25" Nosepiece Adapter
  • 1.25" Cap
  • 2-metre USB 3.0 Cable
  • 2-metre ST-4 Cable
  • Driver CD


Sensor 1/3″ CMOS AR0130CS(Color) / MT9M034(mono)
Resolution 1.2Mega Pixels 1280×960
Pixel Size 3.75µm
Exposure Range 64µs-1000s
ROI Supported
Interface USB3.0/USB2.0
Bit rate 12bit output(12bit ADC)
Adaptor 2″ / 1.25″ / M42X0.75
Dimension φ62mm X 28mm
Weight 100g
Working Temperature -5°C—45°C
Storage Temperature -20°C—60°C
Working Relative Humidity 20%—80%
Storage Relative Humidity 20%—95%


Supported Resolutions:

Binning 1×1:

  • 1280X960@60FPS
  • 1280X720@98FPS
  • 1280X600@116FPS
  • 1280X400@168FPS
  • 960X960@74FPS
  • 1024X768@90FPS
  • 1024X400@160FPS
  • 800X800@85FPS
  • 800X640@106FPS
  • 800X480@141FPS
  • 640X480@133FPS
  • 512X440@145FPS
  • 512X400@158FPS
  • 480X320@196FPS
  • 320X240@254FPS

Binning 2×2:

  • 640X480@45FPS

*Tested under USB3.0 port without overclocking. There is an option to overclock 30% of the current fps

Downloads / Manuals

The following manuals and downloads are available for this product:


ZWO ASI Camera User Manual v1.3 (PDF)

ZWO ASI USB2.0 Camera FAQ v1.0 (PDF)

ZWO ASI USB2.0 Camera Troubleshooting v1.0 (PDF)


ZWO Software and Drivers


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